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Bandstop filters with variable upper passbands using embedded line, spurline, and conventional microstrip
Author(s) -
Huse ChingWen,
Tsai YiHsien,
Wu ChangYu
Publication year - 2011
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.26107
Subject(s) - microstrip , stopband , passband , center frequency , band stop filter , stub (electronics) , bandwidth (computing) , microwave , electronic engineering , planar , acoustics , engineering , physics , band pass filter , low pass filter , computer science , telecommunications , computer graphics (images)
Three planar structures including embedded line, spurline, and conventional microstrip are used to implement bandstop filters and their performances of bandwidth, center frequency and higher‐order stopbands are studied in the discrete‐time domain. A two‐section, equal‐length stub is presented to change the ratio of the next higher‐order harmonic frequency to the fundamental frequency. A filter having upper passband widths of up to nine times the fundamental stopband central frequency can be obtained by using conventional microstrip. A higher‐order bandstop filter is implemented with hybrid embedded line, spurline, and conventional microstrip to show the validity of the design method. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26107